3.3.1. Demographic characteristics, and family structure and socio-economic status
After controlling all potential factors, age, gender, and class type were found to be significantly associated with sleep duration <8.0 h on weekdays (Supplementary Table S3). For sleep duration on weekends, age and class type were independent influential factors.
3.3.2. Biological/psychosocial conditions, and family history of sleep disorders
The association of sleep duration on weekdays with biological/ psychosocial conditions and family history is presented in Table 1. After adjusting only for demographic and socio-economic characteristics, six factors (chronic pain, history of ADHD diagnosis, bedtime anxiety, bedtime excitement/depression, parents’ and grandparents’ history of sleep disorders) were significantly associated with an increased likelihood of shorter sleep duration (model I). After further adjusting for biological/psychosocial conditions and family history of sleep disorders, three factors (chronic pain, bedtime anxiety, and parents’ history of sleep disorders) remained statistically significant (model II). The associations were not found to be changed after adjusting for environmental and behavioral variables simultaneously (model III).
The association of weekend sleep duration with biological/ psychosocial conditions and family history is demonstrated in Table 1. After controlling for all factors simultaneously, the full model indicated that overweight/obesity, bedtime anxiety, and bedtime excitement/depression were independent risk factors.
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